Conference Paper

Defects identification in rods via the Wavelet Transform of transient vibrations

  • E. Castro /
  • A. Gallego /
  • A. Benavent /
  • R. Piotrkowski
Conference Proceeding cp
Proceedings of the 3rd European Workshop - Structural Health Monitoring 2006
  • Fecha: 01 December 2006
  • Páginas: 659-666
  • ISBN: 1932078630
  • Source Type: Conference Proceeding
  • Document Type: Conference Paper
Many structure damage detection methods published during recent years are based on the Spatial Wavelet Transform. However, this technique requires measuring the vibration signal (displacement or acceleration) at numerous points of the damaged specimen, necessitating, in practice, a large number of sensors or only one sensor moving along the specimen. This paper presents a method for detection and location of damage based on the Wavelet Transform of temporal vibration signals measured at only one point of the damaged specimen (Temporal Wavelet Transform). It is demonstrated that the damage detection can be achieved by observing the waves owing to the defect in the vibration-response temporal wavelet domain, even in the case of low frequency vibrations and low intensity of damage. Its location can be determined by measuring the arrival time of those waves. The viability of our proposal is demonstrated by using free and forced vibrations in rods in which the damaged zone has been simulated by reducing stiffness, showing that Level 3 in damage detection is attained. In all cases, the vibration signals are numerically obtained by the Network Simulation Method.

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